APPENDIX. .808 
by Cornil to the genus Bacillus; at any rate, in the case 
of organisms peculiar to human ‘diseases: 
The genus Bacillus, according to Klein (Desmobac- 
terium, Cohn), includes microbes in the form of more or 
less elongated rods, which divide by fission into straight, 
curved, or zigzagged chains, formed of elements penerally 
in contact by their sqnare-cut edges, and which may be 
considerably elongated in the form of Leptothriz. 
,Some of these, when isolated or in short chains, pos- 
sess a flagellum at one extremity, and are consequently 
mobile—such is the case with Bacillus subtilis and most 
of the bacilli of putrefaction—but they lose this organ 
of movement on passing into the state of Leptothrizx. 
Bacillus anthracis is always stationary, and devoid of 
flagellum. The fact that there is in this genus a vibratory 
cilium, and consequently motion, breaks down the barrier 
between the genera Bacterium and Bacillus, and con- 
sequently justifies Cornil’s view. 
The genera Spirillum (Spirobacterium, Cohn,) and 
Spirochete are much more rare, and have not given rise 
to the same variations in nomenclature. 
We conclude by reproducing the classification of 
Rabenhorst and Fliigge, as it is given by Cornil and 
Babés, in order to serve as a convenient scheme for the 
pathogenic bacteria in which we are specially interested : 
